Browsing by Author "Nair, N R"
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ArticleItem Open Access Bhadra (MO 4) A high yielding dwarf rice variety for Kuttanad(Kerala Agricultural University, 1981) Nair, N R; Nair, S S; Rema Bai, NIR-8 and Ptb-20 were crossed in 1967-68 at Rice Research Station Moncompu in order to evolve a high yielding variety possessing good grain quality attributes. Culture M-11-57-5-1 is a derivative of the above cross. It has recorded significantly higher yield than the popular high yielding varieties Jaya and Bharathy in the experiments in the Research Station, in State Seed Farm and in cultivators' fields It was also superior to two other varieties Sabari and Aswathi under Kuttanad conditions. Further, this possesses additional attributes like good tolerance to Brown plant hopper and desirable grain qualities. This culture was released by the variety Release Committee of the State as a 'variety under the name "Bhadra" (M 04).ArticleItem Open Access Comparative study of soil and foliar application of urea on sesamum(Kerala Agricultural University, 1975) Nair, N R; Santhakumari, R; Gopalakrishnan, R; KAUAn experiment to study the comparative effect of soil and foliar application of urea on yield of sesamum was conducted at the Oil Seed Research Station, Kayamkulam during 1971 - 72, Application of half the quantity of urea as basal and half the quantity through foliage 20 days after sowing has been found to be beneficial in increasing yield of sesamum. Spraying 3 .28 per cent urea 20 days after sowing has been observed to cause leaf scorching which reduced the yield considerably.ThesisItem Open Access Genetic analysis of productivity and quality parameters in ricebean (Vigna umbellata [Thunb] Ohwi & Ohashi)(Department of Plant Breeding and Genetics, College of Agriculture, Vellayani, 1995) Suresh Kumar, N S; KAU; Nair, N RA study on the variability, correlation and path coefficient analysis was undertaken in 21 varieties of ricebean along with the cooking qualities. The study was conducted at the Department of Plant Breeding, College of Agriculture, Vellayani during kharif 1993. The varieties showed significant difference in all the characters studied except number of primary branches, pods/plant and seeds/pod. Genotypic coefficient of variation was maximum for haulm yield and minimum for days to maturity. At genotypic level grain yield per plant showed positive correlation with plant height, number of primary branches, pods/plant, seeds/pod, days to maturity, nodule weight and protein content. High heritability estimates were observed of 100 seed weight, protein content, root weight and haulm yield. High genetic advance with high heritability was observed for haulm yield, root weight and protein content indicating the presence of additive gene action. Path coefficient analysis indicated that number of primary branches, pods/plant, days to maturity, nodule weight and protein content exerted positive direct effect on seed yield. Cooking quality studies showed that optimum cooking time ranged between 40-70mts, water uptake ranged between 0.79 g/g to 1.2 g/g and volume of extraction ranged between 58.33% to 68.42%. Organoleptic studies revealed that the variety 23Lg is the most acceptable. The study indicated that the model for selection for ricebean varieties should be one with more number of primary branches and pods per plant, more number of days to maturity, high nodule weight and protein content.ArticleItem Open Access IIHR 61-B, a high yielding vegetable type of cowpea(Kerala Agricultural University, 1991) Neema, V P; Bridgit, T K; James, K I; Nair, N R; KAUArticleItem Open Access Limnaea Acuminata Lamarch (Pulmonata : Limnaeidae) A pest on azolla (Azolla Pinnata)(Kerala Agricultural University, 1979) Ittyaverah, P J; Nair, N R; Thomas, M J; KAUArticleItem Open Access Melanagromyza azawii spencer (Agromyzidae: Diptera) - as a pest of sesamum(Kerala Agricultural University, 1980) Balakrishna Pillai, K; Thomas, M J; Nair, N R; KAUArticleItem Open Access New high yielding, brown plant hopper tolerant variety of rice(Kerala Agricultural University, 1978) Nair, N R; Nair, S S; Remabai, N; KAUArticleItem Open Access Occurrence of Solenopsis geminata Fabr. (Formicidae: Hymenoptera) as a predator of the brown plant hopper(Kerala Agricultural University, 1980) Thomas, M J; Balakrishna Pillai, K; Nair, N R; KAUThesisItem Open Access Progeny studies of interspecific crosses of abelmoschus(Department of Plant Breeding, College of Agriculture,Vellayani, 1988) Renie Alex, KAU; Nair, N RA study was conducted at the Department of Plant Breeding, College of Agriculture, Vellayani during 1987-’88 aimed at evaluating the F4 generation of interspecific hybrids between two yellow vein mosaic susceptible cultivars of Abelmoschus esculentus and the resistant semi-wild species, A. manihot for yellow vein mosaic resistance and yield. The estimation of genetic parameters of important economic characters, the association among these characters and the path coefficient analysis were undertaken. The F4 progeny lines were evaluated in an RBD with three replications. The genotypes showed significant differences in most of the characters studied. Genotypic coefficient of variation was maximum for number of branches per plant and minimum for first fruiting node. Plant height, days to flowering and fruiting phase showed high heritability and appreciable genetic advance while number of seeds per fruit recorded moderately high heritability and appreciable genetic advance indicating the presence of additive gene action. Number of branches per plant, fruit girth and yellow vein mosaic intensity exhibited high heritability and low genetic advance, while weight of single fruit, fruit length and shoot and fruit borer incidence recorded moderately high heritability and low genetic advance. Correlation studies revealed that number of branches per plant, number of fruits per plant, fruiting phase, number of flowers per plant, weight of single fruit, percentage fruit set, fruit length, fruit girth and number of seeds per fruit exhibited positive correlation to yield and could be considered as the major yield attributing characters. Path coefficient analysis projected number of fruits per plant and plant height as the traits exerting high positive direct effect on yield, while number of branches per plant, number of flowers per plant and fruit length exerted high positive indirect effect on yield through number of fruits per plant. The study indicated that the model for selection of a high yielding variety of bhindi should be based on number of fruits per plant, plant height, number of flowers per plant, fruit length and number of branches per plant. However, scoring for yellow vein mosaic intensity in the F4 progenies revealed that plants resembling the wild parent A.manihot in its short stature, lesser number of branches, increased fruit girth and number of seeds per fruit were resistant to the disease. However, since the fruits of these plants did not conform to the quality standards of cultivated bhindi and had higher percentage of shoot and fruit borer incidence, they were not selected. Plants resistant to the disease and resembling the cultivated bhindi were selected to carry forward to the next generation.ArticleItem Open Access Relative susceptibility of some rice varieties to infestation by rice leaf roller(Kerala Agricultural University, 1979) Balakrishna Pillai, K; Nair, N R; Thomas, M J; KAUArticleItem Open Access Tolerance of some rice varieties to whorl maggot damage(Kerala Agricultural University, 1979) Balakrishna Pillai, K; Nair, N R; Thomas, M J; KAU